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Fiber laser with spotlighting layer structure

A fiber laser and concentrating layer technology, applied in the fields of high-power lasers and optical communications, can solve the problems of complex process requirements, fiber mechanical damage, and fiber mechanical strength reduction, to simplify the process, concentrate light energy, and increase coupling efficiency. and the effect of output power

Inactive Publication Date: 2012-05-30
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problems to be solved by the present invention are: the existing side pumping technology of fiber lasers has too complicated technical requirements and mechanical damage to the optical fiber, so that the mechanical strength of the optical fiber is greatly reduced; the optical power density at the coupling point is too high, which is extremely Easy to cause fiber damage

Method used

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  • Fiber laser with spotlighting layer structure
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  • Fiber laser with spotlighting layer structure

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Experimental program
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Effect test

Embodiment approach 1

[0026] Fiber lasers with light-concentrating layer structures, such as figure 1 , 2 , the fiber 4 of the fiber laser includes a core 1, a cladding 2, and a light-concentrating layer 3, as well as a first fiber grating 61 and a second fiber grating 62 written on the fiber, and the pump light output by the pump source 5 directly irradiates on the side of the optical fiber 4.

[0027] The cross-section of the light-gathering layer 3 is an ellipse with the side length of the inscribed regular hexagon of the cladding outer circle of the optical fiber as the major axis, and three adjacent ellipses are taken; the light-gathering layer 3 is located on the cladding 2. In half of the cross-section, the other half of the cladding 2 is coated with a total reflection mirror 7.

[0028] The refractive index of the core 1 is 1.4, the refractive index of the cladding 2 is 1.3, and the refractive index of the light-gathering layer 3 is 1.5.

[0029] The diameter of the core 1 is 5 μm, and t...

Embodiment approach 2

[0032] Fiber lasers with light-concentrating layer structures, such as image 3 , 4 , the fiber 4 of the fiber laser includes a core 1, a cladding 2, and a light-concentrating layer 3, as well as a first fiber grating 61 and a second fiber grating 62 written on the fiber, and the pump light output by the pump source 5 directly irradiates on the side of the optical fiber 4.

[0033] The cross-section of the light-concentrating layer 3 is an ellipse whose side length is the long axis of a regular octagon concentric with the optical fiber in the cladding 2 .

[0034] The refractive index of the core 1 is 1.8, the refractive index of the cladding 2 is 1.7, and the refractive index of the light-gathering layer 3 is 1.9.

[0035] The diameter of the core 1 is 8 μm, and the outer radius of the optical fiber 4 is 100 μm.

[0036] The matrix material of the optical fiber is quartz.

Embodiment approach 3

[0038] Fiber lasers with light-concentrating layer structures, such as Figure 5 , 6 , the fiber 4 of the fiber laser includes a core 1, a cladding 2, and a light-concentrating layer 3, as well as a first fiber grating 61 and a second fiber grating 62 written on the fiber, and the pump light output by the pump source 5 directly irradiates on the side of the optical fiber 4.

[0039] The cross-section of the light-concentrating layer 3 is an ellipse whose major axis is the side length of a regular quadrilateral inscribed on the cladding outer circle of the optical fiber.

[0040] The refractive index of the core 1 is 1.7, the refractive index of the cladding 2 is 1.6, and the refractive index of the light-gathering layer 3 is 1.8.

[0041] The diameter of the core 1 is 6 μm, and the outer radius of the optical fiber 4 is 80 μm.

[0042] The matrix material of the optical fiber is pure silicon.

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Abstract

The invention, which relates to the industrial processing and large power laser field, discloses a fiber laser with a spotlighting layer structure. The fiber laser comprises a fiber (4) and a pumping source (5). The fiber (4) includes a fiber core (1), a cladding (2), a spotlighting layer (3), a first fiber grating (61) and a second fiber grating (62), wherein the first fiber grating (61) and thesecond fiber grating (62) are imprinted in the fiber. A cross section of the spotlighting layer (3) is a an ellipse whose major axis is a side of a regular N side polygon, wherein the regular N side polygon is the inscribed regular N side polygon of a cladding excircle of the fiber or is concentric with the fiber in the cladding (2), and N is an integer in a range of 4 to 8. Diameter of the fibercore (1) is 5m micron to 8m micron and outer radius of the fiber is 62.5 m micron to 100 m micron. Host materials of the fiber are plastics, pure silicon or quartz. A side pumped mode is employed. A mechanical damage problem brought by machining existing in a point access method of fiber side pumping and a light damage problem brought by a high optical power density can be solved.

Description

technical field [0001] The invention relates to a fiber laser. It is especially used in the field of optical communication and high-power laser field. Background technique [0002] Since the advent of the laser, its good light characteristics have been widely recognized. With the development of technology, the power of the laser is increasing, and the application of high-power special mode field lasers in parts processing, optical communication, and national defense is increasing. Get people's attention, its wide range of applications makes people invest more and more in this kind of laser. Although the power of the laser has been improved to a certain extent, the output power of the single-mode laser cannot meet the actual demand. In particular, fiber lasers have developed the most rapidly in recent years, thanks to their compact equipment structure and high conversion efficiency. However, with the continuous development of technology and the continuous improvement of res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067
Inventor 宁提纲温晓东裴丽李晶郑晶晶顔玲玲
Owner BEIJING JIAOTONG UNIV